Pharmaceutical compositions containing halo-substituted 2-amino-benzylamine-amides

ABSTRACT

Antitussive and respiration-stimulating pharmaceutical compositions containing as an active ingredient a compound of the formula   WHEREIN Hal is chlorine or bromine, R1 is hydrogen, chlorine or bromine, R2 is alkyl of one to four carbon atoms, allyl, phenyl, chlorophenyl, methoxyphenyl, carboxyphenyl, carbomethoxyphenyl, tolyl, benzyl, methoxypropyl, cyclohexyl, phenethyl or dimethylaminopropyl, R3 and R4 are each hydrogen, acetyl or benzoyl, R5 is hydrogen, alkyl of one to three carbon atoms or cyclohexyl, R6 is hydrogen, alkyl of one to three carbon atoms, hydroxyethyl, methoxypropyl, allyl, diethylaminoethyl, diethylamino-propyl, phenyl, fluorophenyl, benzyl or cyclohexyl, and N IS 1, 2 OR 3, OR A NON-TOXIC, PHARMACOLOGICALLY ACCEPTABLE ACID ADDITION SALT THEREOF; AND A METHOD OF SUPPRESSING THE COUGH REFLEX AND STIMULATING THE RESPIRATION IN A WARM-BLOODED ANIMAL THEREWITH.

United States Patent [191 Kuger et al.

[451 Jan.29, 1974 PHARMACEUTICAL COMPOSITIONS CONTAINING HALO-SUBSTITUTED Z-AMINO-BENZYLAMINE-AMIDES [73] Assignee: Boehringer Ingelheim GmbH,

Ingelheim am Rhein, Germany [22] Filed: Oct. 24, 1972 [21] Appl. No.: 299,810

Related US. Application Data [30] Foreign Application Priority Data June 8,1965 Germany ..l5l8375 [52] US. Cl. 424/324, 424/330 [51] Int. Cl A6lk 27/00 [58] Field of Search 424/324 [56] References Cited UNITED STATES PATENTS 2,768,202 10/1956 Goldberg et a]. 260/588 Primary ExaminerAlbert T. Meyers Assistant Examiner-Norman A. Drezin Attorney, Agent, or F irm-Nelson Littell et a1.

[5 7] ABSTRACT Antitussive and respiration-stimulating pharmaceutical compositions containing as an active ingredient a compound of the formula wherein Hal is chlorine or bromine,

R, is hydrogen, chlorine or bromine,

R is alkyl of one to four carbon atoms, allyl, phenyl, chlorophenyl, methoxyphenyl, carboxyphenyl, carbomethoxy-phenyl, tolyl, benzyl, methoxypropyl, cyclohexyl, phenethyl or dimethylaminopropyl,

R and R are each hydrogen, acetyl or benzoyl,

R is hydrogen, alkyl of one to three carbon atoms or cyclohexyl,

R is hydrogen, alkyl of one to three carbon atoms, hydroxyethyl, methoxypropyl, allyl, diethylaminoethyl, diethylamino-propyl, phenyl, fluorophenyl, benzyl or cyclohexyl, and

n is 1, 2 or 3,

or a non-toxic, pharmacologically acceptable acid addition salt thereof; and a method of suppressing the cough reflex and stimulating the respiration in a warm-blooded animal therewith.

2 Claims, No Drawings PHARMACEUTICAL COMPOSITIONS CONTAINING HALO-SUBSTITUTED 2-AMINO-BENZYLAMINE-AMIDES This is a division of copending application Ser. No. 89,058, filed Nov. 12, 1970 now US. Pat. No. 3,712,924, which in turn is a continuation-in-part of copending application Ser. No. 872,778, filed Oct. 30, 1969, now abandoned, which in turn is a continuationin-part of Ser. No. 555,696, filed June 7, I966, now abandoned. A This invention relates to novel antitussive and respiration-stimulating pharmaceutical compositions containing a halo-substituted 2-amino-benzylamine-amide or a non-toxic, pharmacologically acceptable acid addition salt thereof as an active ingredient, as well as to a novel method of suppressing the cough reflex and stimulating the respiration in a warm-blooded animal therewith.

More particularly, the present invention relates to antitussive and respiration-stimulating pharmaceutical CHrN.

N Hal wherein Hal is chlorine or bromine,

R, is hydrogen, chlorine or bromine,

R is alkyl of one to four carbon atoms, allyl, phenyl,

chlorophenyl, methoxyphenyl, carboxyphenyl, carbomethoxy-phenyl, tolyl, benzyl, methoxypropyl, cyclohexyl, phenethyl or dimethylaminopropyl,

R and R are each hydrogen, acetyl or benzoyl,

R is hydrogen, alkyl of one to three carbon atoms or cyclohexyl,

R is hydrogen, alkyl of one to three carbon atoms,

hydroxyethyl, methoxypropyl, allyl, diethylaminoethyl, diethylamino-propyl, phenyl, fluorophenyl, benzyl or cyclohexyl, and

n is 1,2 or 3, or a non-toxic, pharmacologically acceptable acid addition salt thereof.

The compounds embraced by formula I may be prepared by a number of different methods involving well known chemical reaction principles, among which the following has proved to be most convenient and efficient:

By reacting a halo-substituted 2-diacylaminobenzyl halide of the formula C Hq-Hal Hal wherein R, and Hal have the same meanings as in formula l and Ac is acyl, with an aminocarboxylic acid amide of the formula R; (l II) wherein R R R and n have the same meanings as in formula I.

The reaction is carried out in the presence of an agent capable of typing up or neutralizing the hydro halic acid released by the reaction, such as an inorganic or tertiary organic base or also a stoichiometric excess of the aminocarboxylic acid amide III. The reaction is preferably performed in the presence of an inert organic solvent, such as carbontetrachloride, chloroform, ethanol, acetone, benzene or toluene, and it proceeds particularly rapidly at elevated temperatures, preferably at the boiling point of the particular solvent which is employed. If an excess of the aminocarboxylic acid amide III or a tertiary organic base is used as the hydrohalic acid-binding agent, these may simultaneously serve as the solvent medium.

The compounds of formula I can also be prepared by reaction of a correspondingly substituted benzylamino carboxylic acid with a correspondingly substituted amine via the mixed anhydride with ethyl chloroformate.

In those instances where the above method yields a compound of the formula I wherein the amino group attached to the benzene nucleus is diacylated, one of these acyl groups may, if desired be split off according to conventional methods. On the other hand, if R in formula I is hydrogen, this hydrogen atom may, if desired, be replaced by an acyl group by customary methods.

The starting materials, that is, compounds of the formulas II and III, are described in the prior art or may readily be prepared by processes described in the prior art.

For instance, a halo-substituted Z-diacylaminobenzyl halide of the formula Il may be prepared by reacting a corresponding halo-substituted 2-diacylamino-toluene with N-bromo-succinimide or with a halogen under ultraviolet irradiation.

The compounds of the formula I above may be transformed into non-toxic, pharmacologically acceptable addition salts with inorganic or organic acids. Examples of non-toxic, pharmacologically acceptable acid addition salts are those formed with hydrochloric acid, hydrobromic acid, sulfuric acid, phosphoric acid, lactic acid, citric acid, tartaric acid, maleic acid, 8- chlorotheophylline or the like.

The following examples further illustrate the present invention and will enable others skilled in the art to understand it more completely,

EXAMPLE 1 Preparation of N-( 2-acetylamino-3,5-dibrorno-benzyl)- N-methyl-glycinamide A mixture of 42 gm of sarcosine methyl ester hydrochloride, 1 liter of chloroform, 84 cc of triethylamine and 129 gm of 2-diacetylamino-3,S-dibromo-benzylbromide was refluxed for three hours. Thereafter, the chloroform was distilled off in vacuo, the residue was taken up in ethylacetate, and the undissolved salts were filtered off. The filtrate was again evaporated, the oily residue was taken up in 400 cc of methanol, the solution was admixed with 300 cc of 2 N sodium hydroxide, and the mixture was allowed to stand overnight at room temperature. Thereafter, the methanol was distilled off in vacuo, and the residual aqueous solution was first extracted with chloroform and then adjusted to pH 6 with 2 N hydrochloric acid. The precipitate formed thereby was separated by vacuum filtration and recrystallized from n-propanol, yielding N-(2-acetylamino-3,5- dibromo-benzyl)-N-methyl-glycine, m.p. l l-l52C.

30 gm of this product were suspended in 300 cc of methanol, the suspension was cooled to 20C, and then, while stirring, the suspension was admixed with a solution of 12 cc of thionylchloride in 75 cc of methanol also at 20C, whereby everything went into solution. The solution was maintained at l5C for 30 minutes and allowed to stand overnight at room temperature. Thereafter, the reaction solution was refluxed for 2 hours, all volatile components were evaporated in vacuo, and the residue was recrystallized first from ethylacetate and then from ethanol, yielding N-(2- acetylamino-3,5-dibromo-benzyl)-N-methyl-glycine methyl ester hydrochloride, m.p. l92-l93C (decomp.).

gm of this product were suspended in a small amount of methanol, and 500 cc of methanolic ammonia were poured over the suspension. The clear solution formed thereby was allowed to stand overnight,

CH2N

Br CH -CONHi EXAMPLE 2 Preparation of N-(2-acetylamino-3,5-dibromo-benzyl)- N-methyl-glycine-[ 3-diethylamino-propyl-( l )amide] 2.0 gm of N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine, obtained as in Example 1, and 0.7 cc of triethylamine were dissolved in l 00 cc of warm tetrahydrofuran, the solution was cooled to -l0C, and 0.48 cc of ethyl chloroformate were added while stirring. After 10 minutes of standing 0.65 gm of N,N-diethyl- 1,3-diamino-propane were added, and the mixture was allowed to come to room temperature. The reaction solution was allowed to stand for 1 hour, was then evaporated in vacuo, the residue was taken up in chloroform, the chloroform solution was washed with water, dilute ammonia and again with water, dried, and the chloroform was evaporated. The residue was recrystallized from ethylacetate, yielding N-(2-acetylamino-3,5- dibromo-benzyl )-N-methyl-glycine[ 3-die'thylaminopropyl-( l )-amide], m.p. l42-l44C, of the formula IIF-COCIIa llr n I EXA MPLE 3 Using a procedure analogous to that described in Example l, N-(2-amino-3,S-dibromo-benzyl)-N-methylglycin amide, m.p. l48l50C, was prepared from N- (2-amino-3,S-dibromo-benzyl)-N-methyl-glycine methyl ester hydrochloride.

EXAMPLE 4 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine isopropylamide, m.p. 208C, of the formula I NH-COCH; Br

was prepared from N-(2 acetylamino-3,S-dibromobenzyl)-N-methyl-glycine and isopropylamine,

EXAMPLE 5 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,S-dibromo-benzyl)-N- methyl-glycine cyclohexyl amide, m.p. l78-l79C, was prepared from N-(2-acetylamino-3,S-dibromobenzyl)-N-methyl-glycine and cyclohexylamine.

EXAMPLE 6 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine benzylamide, m.p. l42l 43C, was prepared from N-( 2-acetylamino-3,S-dibromo-benzyl)- N-methyl-glycine and benzylarnine.

EXAMPLE 7 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine anilide, m.p. 167C, of the formula was prepared from N-(2-acetylamino-3,5-dibromobenzyl)-N-methyl-glycine and aniline.

EXAMPLE 8 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,S-dibromo-benzyU-N- methyl-glycine diethylamide, mp. 100C, was prepared 5 from N-( 2-acetylamino-3 ,5-dibromo-benzyl)-N- methyl-glycine and diethylamine.

EXAMPLE 9 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methy1-glycine-(2-hydroxyethyl-amide), m.p. 127-128C, of the formula 1 NH-COCHz Br was prepared from N-(2-acetylamino-3,S-dibromobenzyl)-N-methyl-glycine' and Z-diethylaminoethylamine.

EXAMPLE 11 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzy1)-N- methyl-glycine-n-propylamide, mp 171C, of the formula 0H, CH -N 0111-0 ONH-n-CuH 6O was prepared from N-(2'acety1amino-3,5-dibromobenzyl)-N-methy1-glycine and n-propylamine.

EXAMPLE 12 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,S-dibromo-benzyl)-N- methyl-glycine-l3-methoxy-n-propyl-( 1 )-amide], mp. 125C, of the formula was prepared from N-(2-acetylamino-3,S-dibromobenzyl)-N-methyl-glycine and l-amino-3-methoxypropane.

EXAMPLE 13 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine-a1lylamide, mp 166C, of the formula was prepared from N-(2-acetylamino-3,5-dibromobenzyl)-N-methyl-g1ycine and allylaminet EXAMPLE 14 Using a procedure analogous to that described in Ex- 0 ample 2, N-(2-acetylamino-3,5-dibromo-benzy1)-N- methy1-glycine-(p-fluoro-anilide), m.p. l74175C, of the formula NH-o o CH:

cm-N

was prepared from N-(2-acetylamino-3,S-dibromobenzyl)-N-methyl-g1ycine and p-fluoro-aniline.

EXAMPLE 15 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine-dicyclohexylamide, mp. 154C, of the CH: CH1N B r CHr-C O N was prepared from N-(2-acetylamino-3,S-dibromobenzyl)-N-methyl-glycine and dicyclohexylamine.

EXAMPLE 16 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- methyl-glycine-(benzyl-isopropyl-amide), an amorphous, thin-film-chromatographically uniform sub stance, R 0.4 (SiO chloroform), was prepared from N-( 2-acetylamino-3 ,5-dibromobenzyl)-N-methylglycine and benzyl-isopropyl-amine.

EXAMPLE 17 Using a procedure analogous to that described in EX- ample l, y-[N-(2-acetylamino-3,5-dibromo-benzyl)-N- iso-propyl]-amino-butyric acid diethylamide, a colorless oil, thin-f1lm-chromatographically uniform, R, 0.6 (SiO chloroform methanol :1 of the formula was prepared from 2-diacetylamino-3,S-dibromobenzyl bromide and 'y-isopropylamino-butyric acid diethylamide.

EXAMPLE 18 Using a procedure analogous to that described in Example 2, N-( 2-acetylamino-4-brorno-benzyl)-N- methyl-glycine-benzylamide, m.p. l69l7lC, was prepared from N-(2-acetyl-amino-4-bromo-benzyl)-N- methyl-glycine and benzylamine.

EXAMPLE 19 Using a procedure analogous to that described in Example 2, N-(2-acetylarnino-5-bromo-benzyl)-N methyl-glycine -benzylamide, m.p. l77l78C, was prepared from N-(2-acetyl-amino-S-bromo-behzyl)-N- methyl-glycine and benzylamine.

EXAMPLE 20 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N- ethyl-glycine-benzylamide, m.p. 149C, was prepared from N-(2-acetylamino-3,5-dibromo-benzyl)-N-ethylglycine and benZyLamine.

EXAMPLE 21 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-3,5-dibromo-benzyl)-N-(nbutyl)-glycine-benzylamide, m.p. 106C, was prepared from N-(2-acetylamino 3,5-dibromo-benzyl)-N-(nbutyl)-glycine and benzylamine.

EXAMPLE 22 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-6-chloro-benzyl)-N- methyl-glycine-benzylamide m.p. 1 l4-l 15C, was prepared from N-(2-acetyl-amino-6-chloro-benzyl)-N- methyl-glycine and benzylamine.

EXAMPLE 23 Using a procedure analogous to that described in Example 2, N-(2-acetylamino-6-chloro-benzyl)-N-ethylglycine benzylamide, m.p. l0O*lOlC, was prepared from N-(2-acetyl-amino-6-chloro-benzyl)-N- ethylglycine and benzylamine.

EXAMPLE 24 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-6-chloro-benzyl)-N- methyl-glycine-isopropylamide, m.p. l53l55C, was prepared from N-(2-benzoylamino-6-chloro-benzyl)- N-methyl-glycine and isopropylamine.

EXAMPLE 25 EXAMPLE 26 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-6-chloro-benzyl)-N- methyl-glycine-anilide, m.p. 142C, was prepared from N-(2-benzoyl-amino-6-chloro-benzyl)-N-methylglycine and aniline.

EXAMPLE 27 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-6-chloro-benzyl)-N- methyl-glycine-diethylamide, m.p. 981O 1 C, was prepared from N-(2-benzoylamino-6-chl0ro-benzyl)-N- methyl-glycine and diethyl-amine.

EXAMPLE 28 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-3,S-dibromo-benzyl)-N- ethyl-glycinamide, m.p. l-73-l74C, was prepared from N-(2-benzoyl-amino-3,5-dibromo-benzyl)-N- ethyl-glycine and concentrated ammonia.

EXAMPLE 29 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-3,5-dibromo-benzyl)-N- ethyl-glycine-isopropylamide, m.p. ll 72C, was prepared from N-(2-benzoylamino-3,S-dibromobenzyl)-N-ethyl-glycine and isopropylamine.

EXAMPLE 30 Using a procedure analogous to that described in Example 2, N-(Z-benzoylamino-S-chloro-benzyl)-N- methyl-glycinamide, m.p. l55l57C, was prepared from N-(2-benz0yl-amino 5-chlorobenzyl)-N-methylglycine and concentrated ammonia.

EXAMPLE 31 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-5-chloro-benzyl)-N- methyl-glycine-isopropylamide, m.p. l22-l24C, was prepared from N-(2-benzoylamino-5-chloro'benzyl)- N-methyl-glycine and isopropylamine.

EXAMPLE 32 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino'5-chloro-benzyl)-N- methyl-glycine-cyclohexylamide, m.p. l90-l92C, was prepared from N-(2-benzoylamino-5-chlorobenZyU-N-methyI-gIycine and cyclohexylamine.

EXAMPLE 33 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-5-chloro-benzyl)-N- methyl-glycine-anilide, m.p. l57l59C, was prepared from N-(2-benzoylamino-5-chloro-benzyl)-N-methylglycine and aniline.

EXAMPLE 34 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino4-chloro-benzyl)-N- methyl-glycin-amide, m.p. l3l132C, was prepared from N-(2-benzoyl-amino-4-chloro-benzyl)-N-methylglycine and concentrated ammonia.

EXAMPLE 35 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-4-chloro-benzyl)-N- methyl-glycine-allylamide, m.p. 97-98C, was prepared from N-(2-benzoyl-amino-4-chloro-benzyl)-N- methyl-glycine and allylamine.

EXAMPLE 36 EXAMPLE 37 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-4-chloro-benzyl)-N- methyl-glycine-cyclohexylamide, m.p. 138-l39C, was prepared from -N-(2-benzoylamino-4-chlorobenzyl)-N-methyl-glycine and cyclohexylamine.

EXAMPLE 38 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-4-chloro-benzyl)-N- methyl-glycine-benzylamide, m.p. l4l-142C, was prepared from N-(2-benzoylamino-4-chloro-benzyl)- N-methyl-glycine and berizylamine.

EXAMPLE 39 Using a procedure analogous to that described in Example 2, N-(2-benzoylamino-4-chloro-benzyl)-N- methyl-glycine-anilide, m.p. 144-145C, was prepared from N-(2-benzoylamino-4-chloro-benzyl)-N-methylglycine and aniline.

The compounds embraced by formula I above and their non-toxic, pharmacologically acceptable acid adsuppositories and the like. One dosage unit of a compound embraced by formula I is from 0.166 to 5.0 mgm/kg, preferably 0,33 to 1.67 mgm/kg body weight.

The following examples illustrate a few pharmaceutical dosage unit compositions comprising a compound embraced by formula I as the active ingredient. The parts are parts by weight, unless otherwise specified.

EXAMPLE 40 Syrup The syrup was compounded from the following ingredients:

N-(2-benzoylamino-4-chloro-benzyl )-N- methyl-glycine-isopropylamide hydrochloride parts by volume Tartaric acid 0.5 Ammonium chloride 0.4 Benzoic acid 0.2 Sugar 65.0 Sodium pyrosulfite 0.] Flavoring 0.2 Certified food colors 0.002 Ethanol 10.0 Distilled water q.s.ad 100.0

Compounding procedure:

The distilled water was heated to C, and then the benzoic acid, the tartaric acid, the ammonium chloride, the glycinamide compound, the food colors and the sugar were successively dissolved therein. The resulting syrup was cooled to room temperature, the sodium pyrosulfite was dissolved therein, and then a mixture of the flavoring and the ethanol was stirred in. The finished syrup was filtered through a suitable filter. 5 cc of the finished syrup contained 25 mgm of the active ingredient and, when administered perorally to a warmblooded animal of about 60 kg body weight in need of such treatment, produced very good antitussive and respiration-stimulating effects.

EXAMPLE 41 Drop Solution The solution was compounded from the following ingredients:

N-( 2-acetylamino-G-chloro-benzyl) N- (methyl) glycinebenzylamide parts by volume p-Hydroxybenzoic acid methyl ester 0.07 p-Hydroxybenzoic acid propyl ester 0.03 Polyvinylpyrrolidone 5.00 Distilled water q.s.ad 100.00

Compounding procedure:

The p-hydroxybenzoic acid esters, the polyvinylpyrrolidone and the glycinecompound were successively dissolved in a sufficient amount of distilled water at 80C. The resulting solution was cooled to room temperature, diluted with additional distilled water to EXAMPLE 42 Coated pills The pill cores were compounded from the following ingredients:

N-t Z-acetylamino-3,5-dibromo-benzyl )-N- methyl-glycinamide parts Lactose 120.0 Potato starch 67.0 Polyvinylpyrrolidone 6.0 Magnesium stearate 2.0

Total 220.0

Compounding procedure:

The glycinamide compound, the lactose and the potato starch were intimately admixed with each other, the mixture was moistened with an aqueous 12.5 percent solution of the polyvinylpyrrolidone, and the moist mass was forced through a 1.5 mm-mesh screen. The resulting granulate was dried at 45C and again passed through a 1.0 mm-mesh screen. The dry granulate was then thoroughly admixed with the magnesium stearate, and the mixture was compressed into 220 mgm-pill cores, which were subsequently coated with a thin shell consisting essentially of talcum and sugar. The coated pills were finally polished with beeswax. Each pill contained 25 mgm of the active ingredient and, when administered perorally to a warm-blooded animal of about 60 kg body weight in need of such treatment, produced very good antitussive and respirationstimulating effects.

EXAMPLE 43 Tablets The tablet composition was compounded from the following ingredients:

N-( Z-acetylamino-3,5-dibromo-benzyl )-N-(n- Compounding procedure:

The glycinamide compound, the lactose and the potato starch were intimately admixed with each other, and the mixture was moistened with an aqueous percent solution of the gelatin. The moist mass was forced through a 1.5 mm-mesh screen, and the resulting granulate was dried at 45C and again passed through the screen. The dry granulate was thoroughly admixed with the silicic acid and with the magnesium stearate, and the mixture was compressed into 400 mgm-tablets. Each tablet contained 50 mgm of the active ingredient and, when administered perorally to a warm-blooded animal of about 60 kg body weight in need of such treatment, produced very good antitussive and respiration-stimulating effects.

EXAMPLE 44 Suppositories The suppository composition was compounded from the following ingredients;

N-(2-benzoylamino-4-chloro-be nzyl)-N- methyl-glycine-isopropylamide parts Cocoa butter 1675.0

Total 1700.0

Compounding procedure:

The finely powdered glycinamide compound was stirred in the cocoa butter, which had previously been melted and cooled to 40C, and the mixture was ho mogenized. The composition was then poured at about 37 C into cooled suppository molds, each holding 1700 mgm of the mixture. Each suppository contained 25 mgm of the active ingredient and, when administered by the rectal route to a warm-blooded animal of about 60 kg body weight in need of such treatment, produced very good antitussive and respirationstimulating effects.

EXAMPLE 45 Hypodermic Solution The solution was compounded from the following ingredients:

butyl) glycine-benzylamide parts 20.0

Tartaric acid 2.0 Sorbitol 50.0 Distilled water q.s.ad 1000.0

Compounding procedure:

The tartaric acid, the glycinamide compound and the sorbitol were successively dissolved in a sufficient amount of warm distilled water. The solution was cooled to room temperature, diluted with distilled water to the desired volume, and filtered until free from suspended matter. The solution was then filled into white 1 cc-ampules, which were then selaed and sterilized for twenty minutes at C. Each ampule contained 20 mgm of the active ingredient, and when the contents thereof were administered parenterally to a warm-blooded animal of about 60 kg body weight in need of such treatment, very good antitussive and respiration-stimulating effects were obtained.

Analogous results were obtained when any one of the other compounds embraced by formula I or a non-toxic pharmacologically acceptable acid addition salt thereof was substituted for the particular halo-substituted 2-amino-benzylamine-amide compound in illustrative Examples 40 to 45. Likewise, the amount of active ingredient in these examples may be varied to achieve the dosage unit range set forth above, and the amounts and nature of the inert pharmaceutical carrier ingredients may be varied to meet particular requirements.

While the present invention has been illustrated with the aid of certain specific embodiments thereof, it will be readily apparent to others skilled in the art that the invention is not limited to these particular embodiments, and that various changes and modifications may be made without departing from the spirit of the invention or the scope of the appended claims.

We claim:

1. A pharmaceutical dosage unit composition consisting essentially of an inert pharmaceutical carrier and an effective antitussive and respiration-stimulating need thereof, which comprises administering to said amount of a compound of the formula animal an effective antitussive and respirationstimulating amount of a compound of the formula CHI N\ 0 /Rs R1 /R2 (CHDFPLW cmN 0 Ra Ra 2)n -N Hal 83T V Hal NH-Rt wherein Hal is chlorine or bromine, wherein R is hydrogen, chlorine or bromine, Hal is chlorine or bromine, R is alkyl of one to four carbon atoms, R is hydrogen, chlorine or bromine, R is acetyl or benzoyl, R is alkyl of one to four carbon atoms, R is hydrogen, alkyl of one to three carbon atoms or R is acetyl or benzoyl,

cyclohexyl, R is hydrogen, alkyl of one to three carbon atoms or R is hydrogen, alkyl of one to three carbon atoms, cyclohexyl,

hydroxyethyl, methoxypropyl, allyl, diethylamino R is hydrogen, alkyl of one to three carbon atoms, -ethyl, diethylamino-propyl, phenyl, fluorophenyl, hydroxyethyl, methoxypropyl, allyl, diethylamibenzyl or cyclohexyl, and noethyl, diethylamino-propyl, phenyl, fluoron is l, 2 or 3, phenyl, benzyl or cyclohexyl, and or a non-toxic, pharmacologically acceptable acid adn is l, 2 or 3, dition salt thereof. or a non-toxic, pharmacologically acceptable acid ad- 2. The method of suppressing the cough reflex and dition salt thereof. stimulating the respiration in a warm-blooded animal in 

2. The method of suppressing the cough reflex and stimulatIng the respiration in a warm-blooded animal in need thereof, which comprises administering to said animal an effective antitussive and respiration-stimulating amount of a compound of the formula 